Why interconnect distribution layer switches?

[oswaldo81]

Hi,

I am trying to find the reason where in many Cisco docs, I see the Distribution layer switches in the same switch block interconnected.

e.g. you have a switch block containing two Access layer switches and two Distribution layer switches. Each Access switch has link to both Distribution switches. Also, is the interconnecting link L2 or L3?

Any explanation or links to docs which explain the reason for this would be much appreciated.

Thanks,

Alan

[shastymacnasty]

Jon, you are a gentleman!

Thank you, yes I had done everything as you had mentioned EXCEPT allowing the specific vlans over the trunks to the Edges.

I had configured each link as a trunk and was allowing all the vlans through, hence when i shutdown Fa0/2 the SVI's were not going down and dist A didnt know to send the packets to Dist B.. Thanks again M